ul {
    height: 100%;
    text-align: left;
    padding-left: 30px;
}

li {
    display: inline-block;
    width: auto;
    height: 60px;
    padding: 0 20px;
    line-height: 60px;
    font-size: 14px;
    color: #909399;
    cursor: pointer;
}

.router-link-active {
    font-size: 18px;
    font-weight: bold;
    color: #000 !important;
    border-bottom: 3px solid #409EFF;
    box-sizing: border-box;
}